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(No Model.)

A. RAIS.

MOLD FOR CASTING SEAMLESS TUBING. No. 331,820. Patented Dec. 8, 1885.

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ADRIAN RAIS, \VATEBBURY, CONNECTICUT, ASSIGNOB T O BROVVN & BROTHERS, OFSAME PLACE.

MOLD FOR CASTING SEAMLESS TUBING.

SPEGIPICATIONforming part of Letters Patent No. 331,820, dated December8, 1885.

Applicaiion filed September 16, 1885. Serial No. 177,224. (No model.)

To all whom, it may concern.-

Be it known that I, ADRIAN Bars, a citizen of the United States,residing at \Vaterbury, in the county of New Haven and State ofConnecticut, haveinvented certain new and useful Improvements in Moldsfor Casting Seamless Tubing; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention has for its object to devise a mold and core of this classin which the core is necessarily held exactly central, and in which themold itself is thoroughly protected against the wearing action of themolten metal in the act of pouring.

In order that my invention may be clearly understood, 1 will describethe same in connection with the accompanying drawings, forming part ofthis specification, in which- Figure 1 is a central longitudinal sectionof the mold complete and ready for use; Fig. 2, an elevation with thereceiver removed, and Fig. 3 a plan view of the upper core-loitdetached.

. A represents the mold, B the base, and G the core, the latter beingmade in the usual or any suitable manner.

An important feature of my improved construction is that the core ismade tapering or inclined inward at both ends, as shown at D. The lowerend of the core rests in a corebit, E, which is provided with an openingthrough it, the upper portion of which is tapered, as at F, tocorrespond with the taper at the lower end of the core. The lowercorebit ordinarily rests upon a pin, G, driven through holes in themold.

H represents a washer, one or more of which may be interposed, ifnecessary, between the pin and the core-bit.

K is an aperture at the upper portion of the mold,through which surplusmetal passes out should more be poured in than is required to form thetube. Above this aperture the diameter of the mold is enlarged, as at L,to receive the upper core-bit. The construction of this upper core-bitis an important feature of my invention. I t consists of an innersleeve, M, having an aperture through it, the

lower portion of which-is tapered downward and outward, as at N,thetaper corresponding exactly with the taper at the upper end of thecore.

O is an outer sleeve whose external diameter just permits it to passinto enlargement L, at the upper portion of the mold. The inner sleeveis supported in the outer sleeve by means of bridges or crosspieces Q,as clearly shown in Figs. 1 and 3.

In pouring the molten metal, if it comes directly in contact with theinterior of the mold the effect is to wear away the metal very rapidly.This difficulty is wholly overcome by means of the sleeve 0, whose innersides are inclined or tapered inward from top to bottom, as shown at Pin Fig. 1, so that the molton metal is turned inward against the coreinstead of coming in contact with the surface of the mold when it ispoured in, as formerly.

R is the receiver provided with a sleeve, S, which fits over theexterior of the mold at the top. This receiver is so constructed that,no matter how the metal is poured in, it can only enter the mold throughthe upper corebit, and, as stated above, is thrown against the coreinstead of the surface of the mold.

In use pin G and the lower core-bit are placed in position. If the moldis short, one or more washers may be used. The core is then placed inposition, and the upper corehit passed over the top of the same andallowed to drop into position within enlarge ment L. It will of coursebe apparent that the corresponding inclines at the lower end of the coreand in the lowercorebit will hold the base of the core firmly inposition. The construction is such that the exact length of the core isnot essential. The upper core-bit will drop down over the core until thecorresponding inclines upon the core and in the core-bit are inengagement. As the external surfaces of sleeve 0 and enlargement L areperpendicular and parallel with each other, it follows that both longand short cores will be held firmly in position.

Having thus described my invention, I claim- 1. A solid core of uniformdiameter, except roo opening tapered upward and outward to receive thebase of the core, and an upper corebit adapted to move vertically in themold, and having an opening tapered downward and outward to engage thetaper of the core, whereby the latter is held firmly whether long orshort.

2. A solid core having reduced tapered portions at both ends, incombination with a corebit having an opening tapered upward and outwardto receive the base of the core, and an upper core-bit consisting of asleeve adapted to move vertically in the mold, and an inner sleeveconnected thereto by cross-pieces, said inner sleeve having an openingtapered downward and outward, to adapt it to slip down upon the inclineof the core, whereby the latter is firmly held in all positions.

3. The combination, with the core, of a corebit consisting of a sleevehaving an opening to receive the core, an outer sleeve whose outer sidesare straight and whose inner sides are inclined inward from top tobottom, and bridges which connect the two sleeves.

4. The combination, with a core tapered at its upper end and acorrespondingly-tapered sleeve which engages said core, of the mold, asleeve fitting within the mold and tapered inward from top to bottom,and bridges extending to the inner sleeve by which the latter issupported.

5. The combination, with the mold, thelower core-bit, and the core, of asleeve which supports the upper end of the core, crosspieces or bridgesQ, and an outer sleeve fitting within the mold and having sides inclinedinward from top to bottom, whereby in pouring the metal is thrownagainst the core, thus protecting the mold.

6. The mold having enlargement L and the core tapered, as shown, incombination with the lower core-bit having a tapered opening, sleeve M,having a tapered opening, and sleeve 0, adapted to fit the enlargementof the mold and having incline P, whereby the metal is thrown againstthecore.

In testimony whereof I affix my signature in presence of two witnesses.

ADRIAN RAIS.

Witnesses:

L. T. WOOSTER, A. M. WOOSTER.

